Sergey Vladimirovich Korsakov
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Sergey Vladimirovich Korsakov (Russian Cyrillic: Сергей Владимирович Корсаков; born 1 September 1984 in Frunze, Kirghiz SSR) is a Russian cosmonaut selected by Roscosmos in 2012. He was scheduled to make his first flight into space in April 2021 as a flight engineer aboard Soyuz MS-18 ahead of a stay aboard the International Space Station; but was replaced on the crew by Mark Vande Hei in March of that year.
Korsakov graduated with high honors from the Bauman Moscow State Technical University in 2006 with a degree in rocketry. After his selection as a cosmonaut in 2012, he was appointed as a test cosmonaut in 2014.